<template>
  <!-- 文章详情 -->
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" left-arrow title="黑马头条"></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="isloading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="info.title">
        <!-- 文章标题 -->
        <h1 class="article-title">{{info.title}}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image class="avatar" slot="icon" round fit="cover" :src="info.aut_photo" />
          <div slot="title" class="user-name">{{info.aut_name}}</div>
          <div slot="label" class="publish-date">{{info.pubdate | formatDate}}</div>
          <!-- 关注按钮 -->
          <!--
              v-model默认解析成
              属性 :value="info.is_followed" 父向子传值
              事件 @input="info.is_followed = $event" 子组件修改数据的事件
           -->
          <userFollowed v-model="info.is_followed" :autId='info.aut_id'>
          </userFollowed>
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content" v-html="info.content" ref="content"></div>
        <van-divider>正文结束</van-divider>
        <!-- 文章评论 -->
        <articleCommon @clickReply="clickReply" :source="info.art_id + ''" @updataTotal='totalCount = $event'
          :list="list"></articleCommon>
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="is404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadInfo">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 底部区域 -->
    <div v-if="info.title" class="article-bottom">
      <van-button class="comment-btn" type="default" round size="small" @click="popupShow = true">写评论</van-button>
      <van-icon name="comment-o" :badge="totalCount" color="#777" />
      <!-- 收藏 -->
      <articleCollected v-model="info.is_collected" :articleId='info.art_id + ""'></articleCollected>
      <!-- 点赞 -->
      <articleLiking v-model="info.attitude" :articleId='info.art_id + ""'></articleLiking>
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->

    <!-- 文章评论弹出层 -->
    <van-popup v-model="popupShow" position="bottom">
      <articlePost :target="articleId" @onPostSuccess="onPostSuccess"></articlePost>
    </van-popup>

    <!-- 回复评论弹出层 -->
    <van-popup v-if="replayShow" v-model="replayShow" position="bottom" :style="{ height: '100%' }">
      <replyPost :comment="comment" @closepopup='replayShow = false'></replyPost>
    </van-popup>
  </div>
</template>

<script>
// 导入图片预览
import { ImagePreview } from 'vant'
import { getArticlesInfo } from '@/api/article.js'
// 导入关注组件
import userFollowed from '@/components/article-item/user-followed.vue'
// 导入收藏组件
import articleCollected from './components/article-collected.vue'
// 导入评论组件
import articleCommon from './components/article-common.vue'
// 导入文章点赞组件
import articleLiking from './components/article-liking.vue'
// 导入发布评论组件
import articlePost from './components/article-post.vue'
// 导入回复评论组件
import replyPost from './components/reply-post.vue'
export default {
  name: 'articles',
  data () {
    return {
      // 文章详情数据
      info: {},
      // 是否显示加载
      isloading: false,
      // 是否是404错误
      is404: false,
      // 评论条数
      totalCount: 0,
      // 评论弹出层显示
      popupShow: false,
      // 评论列表数据
      list: [],
      // 回复评论弹出层
      replayShow: false,
      // 评论数据
      comment: {}
    }
  },
  props: {
    // 路由映射-文章对应id
    articleId: {
      type: [Number, String],
      required: true
    }
  },
  methods: {
    // comment-item组件回复触发
    clickReply (e) {
      this.replayShow = true
      this.comment = e
    },
    // 监听子组件发布评论成功
    onPostSuccess (e) {
      this.list.unshift(e)
      // 关闭弹层
      this.popupShow = false
    },
    // 加载文章详情数据
    async loadInfo () {
      this.isloading = true
      try {
        const { data: res } = await getArticlesInfo(this.articleId)
        this.info = res.data
        this.isloading = false
        this.preImg()
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.is404 = true
        }
        this.$toast('获取详情失败')
        this.isloading = false
      }
    },
    // 图片预览
    preImg () {
      // 获取文章内容
      this.$nextTick(() => {
        const images = []
        // 获取所有图片
        const imgs = this.$refs.content.querySelectorAll('img')
        imgs.forEach((item, i) => {
          images.push(item.src)
          item.onclick = function () {
            ImagePreview({
              images,
              startPosition: i
            })
          }
        })
      })
    }
  },
  computed: {},
  watch: {},
  filters: {},
  components: {
    userFollowed,
    articleCollected,
    articleCommon,
    articleLiking,
    articlePost,
    replyPost
  },
  created () {
    // console.log(this.$route.params.articleId)
    this.loadInfo()
  },
  mounted () { },
  updated () {
    // console.log(this.$refs.content)
  }
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
